Malicious PDF — malware analysis report

Static analysis result for SHA-256 5918bfab52e4caeb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 15:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3a67407ab7c6b2ea70b28da0f90a95e SHA-1: 8d3e6e9a9689dfe6358e1c593f8fb2154deac31e SHA-256: 5918bfab52e4caeb78fb561a5577e6c9dd05c4d850c1cd42e126589f724cac1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The presence of these URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=android+mobile+under+10000+in+nepal PDF link annotation
    • http://bioident.pl/photos_fck/file/penixoma.pdfIn PDF document text
    • http://snft.ro/media/file/5004653987.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/65821667807.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/tugusuzibudipuvifep.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/77136838190.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/1418072624.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/39469219494.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/pojetul.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/18242460146.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c5e1872a54996d7e35f81e4d48b8fdee/gilalata.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/sofuta.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/roxuxexugoligaxepu.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sujoxine.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/nikakezilesifumifimogoj.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/ponoxiwemufasaxunelidorof.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/20405168471.pdfIn PDF document text
    • https://adium.ru/userfiles/file/lakurakomaserimanarog.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614857806d4b6---86044112831.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/31953391055.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/95529126260.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/98063890282.pdfIn PDF document text
    • http://regmac.net/userfiles/files/visepudulalisex.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/72984107552.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/46119624928.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 10680 bytes
SHA-256: c9d2dc78e114d3d45be94dabb01b7426e26c1782583c49152038b975f50a8c8e
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 17980 bytes
SHA-256: 95a66d1eb3c8236f818cb5653e0ae25f42811013467d8b3415361903ccccbce5
font_02_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1